\documentclass[a4paper,10pt]{article}
\usepackage[utf8x]{inputenc}

%opening
\title{}
\author{}

\begin{document}


\section*{}
\begin{table}
\begin{tabular}{|l|l|c|r|}
  \hline
  Nom & Prenom & Age & NUM Etudiant\\
  \hline
  Paul & Lopes &\multicolumn{2}{|c|}{180}\\
  \hline
  Ardo & SALL &{\bf 22} & {\bf 181} \\
  \hline
  JONATHAN & BIZET & {\bf 21} & {\bf 182}\\
  \hline
  LOPES & JOSEPH & {\bf 21} & {\bf 182}\\
  \hline
\end{tabular}
\caption{TABLEAU D ETUDIANT}
\end{table}
\end{document}

